The 2018 Jeep Grand Cherokee uses a standard 12-volt automotive battery. If your model is equipped with the stop-start system, that battery is typically an Absorbed Glass Mat (AGM) type; otherwise it uses a conventional maintenance-free lead-acid battery.
In more detail, the Grand Cherokee’s electrical system runs on a 12-volt battery whose exact type and size can vary by engine and trim. The presence of auto stop-start often drives the battery choice toward AGM to withstand frequent cycling, while models without stop-start generally use a conventional flooded or maintenance-free lead-acid battery. Always verify the specific battery type from the vehicle’s label or the owner's manual for your exact configuration.
Battery types and how they apply to the 2018 Grand Cherokee
There are two common configurations for this vehicle in 2018 depending on whether it has stop-start. The following outlines the typical setup you’ll encounter.
Start-stop explained
Vehicles with the optional stop-start system require a battery designed to handle frequent discharge/recharge cycles. That typically means an AGM battery, which provides better resistance to vibration and higher cycle durability than a conventional flooded unit.
- Conventional flooded lead-acid (maintenance-free) battery: Used on most Grand Cherokee models without stop-start. It’s a standard 12-volt automotive battery that’s reliable for everyday use but isn’t optimized for frequent stop/start cycling.
- Absorbed Glass Mat (AGM) battery: Used on models equipped with the auto stop-start system. AGM batteries tolerate frequent cycling and high current demands during start-up better than conventional batteries.
Be aware that the exact part number and group size can vary by engine (gas vs diesel) and trim. Always verify with the label on your existing battery or the owner's manual.
How to identify and replace the correct battery
Before you replace your battery, confirm the correct type and specifications for your vehicle. The following steps help ensure you choose the right unit:
- Check the battery label: Look for “AGM” if your vehicle has start-stop, or “Flooded” for a conventional unit; note the group size and CCA rating.
- Consult the owner’s manual or dealer parts catalog to confirm the OEM battery specification for your engine and trim.
- When replacing, use a battery that matches or exceeds the OEM CCA rating and reserve capacity, and choose an AGM type if your model uses start-stop.
- Have the battery tested if it’s not starting reliably to determine health; replace if the cold-cranking amps or overall health is poor.
Once you’ve replaced it, keep terminals clean, ensure proper tightening, and consider periodic testing to maintain reliability.
Summary
The 2018 Jeep Grand Cherokee uses a 12-volt automotive battery. Trims with the start-stop system use an AGM battery; other trims use a conventional flooded lead-acid battery. Always verify with the vehicle’s label or manual to confirm the exact battery type, group size, and CCA rating for your specific engine and configuration.